Conventions; Specifications - Fluke 78 Service Manual

78
Service Manual

1-3. Conventions

The following conventions are used in this manual:
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1-4. Specifications

Specifications for the Fluke 78 are in Table 1-1. Accuracy is specified for a period of one
year after calibration, at 18°C to 28°C (64°F to 82°F) with relative humidity to 95%. AC
conversions are ac-coupled, average responding, and calibrated to the rms value of a sine
wave input.
Accuracy Specifications are given as:
1-4
Printed Circuit Assembly (PCA)
A "pca" is a printed circuit board and its attached parts.
Circuit Nodes
A pin or connection on a component is specified by a dash (-) and number following
the component reference designator.
For example, pin 19 of U30 would be U30-19.
User Notation
Switch positions, input terminals, and display annunciators are usually shown as
they appear on the meter.
Mnemonics used in the meter circuit descriptions correspond to those on the
schematic diagrams in Chapter 5.
±([% of reading] + number of least significant digits)